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\(\Rightarrow3x=180+72\\ \Rightarrow x=252:3\\ \Rightarrow x=84\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2.
a, x-13=-46
=>x=(-46)+13
=>x=33
b, 4x-6=22
=>4x=22+6
=>4x=28
=>x=28:4
=>x=7
3.
a, 32=25
48=24.3
=>ƯCLN(32,48)=24=16
16=24
72=23.32
=>ƯCLN(16,72)=23=8
b,
24=23.3
60=22.3.5
=>BCNN(24,60)=23.3.5=120
72=23.32
180=22.32.5
=>BCNN(72,180)=23.32.5=360
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(x-5\right)-27=18\)
\(x-5=45\)
\(x=50\)
vậy \(x=50\)
b) \(\left(3x-2^3\right).25=250\)
\(3x-8=10\)
\(3x=18\)
\(x=6\)
vậy \(x=6\)
c) \(108⋮x\)\(\Rightarrow x\inƯ\left(108\right)\) \(\Rightarrow x\in\left\{1;2;4;...;108\right\}\)
những ý sau làm tương tự
a)(x-5)-27=18
x-5=45
x=50
b)\(\left(3x-2^3\right).25=250\)
\(3x-2^3=10\)
\(3x=18\)
\(x=6\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
a. $=(-25)(-4)(-35)=100(-35)=-3500$
b. $=16-10=6$
c. $=180-(-16)-(-36)=180+16+36=232$
d. $=250-200:[1(-3)^2+(-8)]$
$=250-200:(9-8)=250-200=50$
2.
$60+2(12-x)=-48$
$2(12-x)=60-(-48)=60+48=108$
$12-x=108:2=54$
$x=12-54=-42$
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài 1:
a. $=(-25)(-4)(-35)=100(-35)=-3500$
b. $=16-10=6$
c. $180-(-16)-(-36)=180+16+36=196+36=232$
d. $=250-200:[2000.(-3).2-6]$
$=250-200:[2000.(-6)+(-6)]$
$=250-200:[(-6)(2000+1)]=250-200[(-6).2001]$
$=250+200.6.2001=250+2401200=2401450$
Bài 2:
$60+2(12-x)=-48$
$2(12-x)=-48-60=-108$
$12-x=-108:2=-54$
$x=12-(-54)=66$
![](https://rs.olm.vn/images/avt/0.png?1311)
123-5.(x+4)=38
5.(x+4)=123-38
5.(x+4)=85
x+4=85:5
x+4=17
x=17-4
x=13
(3.x-2^4).7^3=2.7^4
(3.x-16).343=2.2401
(3.x-16).343=4802
3.x-16=4802:343
3.x-16=14
3.x=14+16
3.x=30
x=30:3
x=10
6^2:4.3+2.5^2
=36:4.3+2.25
=9.3+2.25
=27+50
=77
5.4^2-18:3^2
=5.16-18:9
=80-2
=78
80-(4.5^2-3.2^3)
=80-(4.25-3.8)
=80-(100-24)
=80-76
=4
23.75+25.23+180
=23.(75+25)+180
=23.100+180
=2300+180
=2480
2448:[119-(23-6)]
=2448:(119-17)
=2448:102
=24
(2600+6400)-3.x=1200
9000-3.x=1200
3.x=9000-1200
3.x=7800
x=7800:3
x=2600
[(6.x-72):2-84].28=562
(6.x-72):2-84=562:28
(6.x-72):2-84=281/14
(6.x-72):2=281/14+84
(6.x-72):2=1457/14
6.x-72=1457/14.2
6.x-72=1457/7
6.x=1457/7+72
6.x=1961/7
x=1961/7:6
x=1961/42
3x=180+72
3x=252
x=252:3
x=84
\(3x=180+72\\ \Leftrightarrow x=\dfrac{252}{3}=84\)